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For example if you are using hashtag on Facebook, #Morning #Computers #IT or anyother thing, whenever someone will search for that specific keyword your post will appear on their search screen and they would probably visit you, this is mostly used to increase your views.

Use of Hashtags in Social Media, many of the social media sites, like the G+, Facebook, Twitter, Pinterest, use this #tag feature to choose the keywords for the post that your are posting or sharing over social media. This can help you and can act as meta keywords for your post.

Suppose: If you post #example and the other person is also using #example in his or her post and then if the user clicks on the #example keyword, he or she is able to see the post of your also, even if they don't belong to you.